diff --git a/.htaccess b/.htaccess
index 41854420566..8500b50a8fa 100644
--- a/.htaccess
+++ b/.htaccess
@@ -134,9 +134,9 @@ DirectoryIndex index.php index.html index.htm
     RewriteCond %{REQUEST_FILENAME}\.gz -s
     RewriteRule ^(.*)\.js $1\.js\.gz [QSA]
 
-    # Serve correct content types, and prevent mod_deflate double gzip.
-    RewriteRule \.css\.gz$ - [T=text/css,E=no-gzip:1]
-    RewriteRule \.js\.gz$ - [T=text/javascript,E=no-gzip:1]
+    # Serve correct content types, and prevent double compression.
+    RewriteRule \.css\.gz$ - [T=text/css,E=no-gzip:1,E=no-brotli:1]
+    RewriteRule \.js\.gz$ - [T=text/javascript,E=no-gzip:1,E=no-brotli:1]
 
     <FilesMatch "(\.js\.gz|\.css\.gz)$">
       # Serve correct encoding type.
@@ -147,8 +147,10 @@ DirectoryIndex index.php index.html index.htm
   </IfModule>
 </IfModule>
 
-# Add headers to all responses.
+# Various header fixes.
 <IfModule mod_headers.c>
   # Disable content sniffing, since it's an attack vector.
   Header always set X-Content-Type-Options nosniff
+  # Disable Proxy header, since it's an attack vector.
+  RequestHeader unset Proxy
 </IfModule>
diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index dcef8ea97fc..cda01053c84 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,3 +1,9 @@
+Drupal 7.81, 2021-06-02
+-----------------------
+- Block Google FLoC by default
+- Testing and accessibility enhancements
+- Various bug fixes, optimizations and improvements
+
 Drupal 7.80, 2021-04-20
 -----------------------
 - Fixed security issues:
diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index 72c92911d2d..185dd59c6c8 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -8,7 +8,7 @@
 /**
  * The current system version.
  */
-define('VERSION', '7.80');
+define('VERSION', '7.81');
 
 /**
  * Core API compatibility.
diff --git a/includes/common.inc b/includes/common.inc
index a19a5eaacc6..4dec37379ae 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -2696,6 +2696,19 @@ function drupal_deliver_html_page($page_callback_result) {
     drupal_add_http_header('X-Frame-Options', $frame_options);
   }
 
+  if (variable_get('block_interest_cohort', TRUE)) {
+    $permissions_policy = drupal_get_http_header('Permissions-Policy');
+    if (is_null($permissions_policy)) {
+      drupal_add_http_header('Permissions-Policy', 'interest-cohort=()');
+    }
+    else {
+      // Only add interest-cohort if the header does not contain it already.
+      if (strpos($permissions_policy, 'interest-cohort') === FALSE) {
+        drupal_add_http_header('Permissions-Policy', 'interest-cohort=()', TRUE);
+      }
+    }
+  }
+
   // Menu status constants are integers; page content is a string or array.
   if (is_int($page_callback_result)) {
     // @todo: Break these up into separate functions?
@@ -3392,7 +3405,7 @@ function drupal_group_css($css) {
  * @see system_element_info()
  */
 function drupal_aggregate_css(&$css_groups) {
-  $preprocess_css = (variable_get('preprocess_css', FALSE) && (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update'));
+  $preprocess_css = (variable_get('preprocess_css', FALSE) && !defined('MAINTENANCE_MODE'));
 
   // For each group that needs aggregation, aggregate its items.
   foreach ($css_groups as $key => $group) {
@@ -3851,8 +3864,10 @@ function drupal_load_stylesheet_content($contents, $optimize = FALSE) {
     // whitespace.
     // @see http://php.net/manual/regexp.reference.subpatterns.php
     $contents = preg_replace('<
+      # Do not strip any space from within single or double quotes
+        (' . $double_quot . '|' . $single_quot . ')
       # Strip leading and trailing whitespace.
-        \s*([@{};,])\s*
+      | \s*([@{};,])\s*
       # Strip only leading whitespace from:
       # - Closing parenthesis: Retain "@media (bar) and foo".
       | \s+([\)])
@@ -3860,11 +3875,11 @@ function drupal_load_stylesheet_content($contents, $optimize = FALSE) {
       # - Opening parenthesis: Retain "@media (bar) and foo".
       # - Colon: Retain :pseudo-selectors.
       | ([\(:])\s+
-    >xS',
-      // Only one of the three capturing groups will match, so its reference
+    >xSs',
+      // Only one of the four capturing groups will match, so its reference
       // will contain the wanted value and the references for the
       // two non-matching groups will be replaced with empty strings.
-      '$1$2$3',
+      '$1$2$3$4',
       $contents
     );
     // End the file with a new line.
@@ -4505,7 +4520,7 @@ function drupal_get_js($scope = 'header', $javascript = NULL, $skip_alter = FALS
  * @see drupal_add_js()
  */
 function drupal_pre_render_scripts(array $elements) {
-  $preprocess_js = (variable_get('preprocess_js', FALSE) && (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update'));
+  $preprocess_js = (variable_get('preprocess_js', FALSE) && !defined('MAINTENANCE_MODE'));
 
   // A dummy query-string is added to filenames, to gain control over
   // browser-caching. The string changes on every update or full cache
@@ -6941,7 +6956,7 @@ function drupal_array_set_nested_value(array &$array, array $parents, $value, $f
 function &drupal_array_get_nested_value(array &$array, array $parents, &$key_exists = NULL) {
   $ref = &$array;
   foreach ($parents as $parent) {
-    if (is_array($ref) && array_key_exists($parent, $ref)) {
+    if (is_array($ref) && (isset($ref[$parent]) || array_key_exists($parent, $ref))) {
       $ref = &$ref[$parent];
     }
     else {
diff --git a/includes/form.inc b/includes/form.inc
index f2557e83233..3f6c7661adc 100644
--- a/includes/form.inc
+++ b/includes/form.inc
@@ -3924,6 +3924,11 @@ function theme_button($variables) {
   $element['#attributes']['type'] = 'submit';
   element_set_attributes($element, array('id', 'name', 'value'));
 
+  // Remove name attribute, if empty, for W3C compliance.
+  if (isset($element['#attributes']['name']) && $element['#attributes']['name'] === '') {
+    unset($element['#attributes']['name']);
+  }
+
   $element['#attributes']['class'][] = 'form-' . $element['#button_type'];
   if (!empty($element['#attributes']['disabled'])) {
     $element['#attributes']['class'][] = 'form-button-disabled';
diff --git a/includes/menu.inc b/includes/menu.inc
index fb99aac8a25..4965ae3fcc2 100644
--- a/includes/menu.inc
+++ b/includes/menu.inc
@@ -1500,13 +1500,25 @@ function menu_tree_check_access(&$tree, $node_links = array()) {
     $nids = array_keys($node_links);
     $select = db_select('node', 'n');
     $select->addField('n', 'nid');
-    $select->condition('n.status', 1);
+    // When a menu administrator who we know has permission to see unpublished
+    // nodes is administering the menu, included the unpublished nodes in the
+    // tree, with a special flag so that the Menu module can label them.
+    // Otherwise, exclude these nodes from the tree.
+    if (!empty($GLOBALS['menu_admin']) && user_access('bypass node access')) {
+      $select->addField('n', 'status');
+    }
+    else {
+      $select->condition('n.status', 1);
+    }
     $select->condition('n.nid', $nids, 'IN');
     $select->addTag('node_access');
-    $nids = $select->execute()->fetchCol();
-    foreach ($nids as $nid) {
-      foreach ($node_links[$nid] as $mlid => $link) {
-        $node_links[$nid][$mlid]['access'] = TRUE;
+    $node_objects = $select->execute()->fetchAll();
+    foreach ($node_objects as $node_object) {
+      foreach ($node_links[$node_object->nid] as $mlid => $link) {
+        $node_links[$node_object->nid][$mlid]['access'] = TRUE;
+        if (isset($node_object->status)) {
+          $node_links[$node_object->nid][$mlid]['node_unpublished'] = !$node_object->status;
+        }
       }
     }
   }
@@ -1868,7 +1880,7 @@ function menu_navigation_links($menu_name, $level = 0) {
   $router_item = menu_get_item();
   $links = array();
   foreach ($tree as $item) {
-    if (!$item['link']['hidden']) {
+    if ($item['link']['access'] && !$item['link']['hidden']) {
       $class = '';
       $l = $item['link']['localized_options'];
       $l['href'] = $item['link']['href'];
diff --git a/includes/theme.inc b/includes/theme.inc
index 5b602f8d7f3..a1b9324a0c9 100644
--- a/includes/theme.inc
+++ b/includes/theme.inc
@@ -418,7 +418,7 @@ class ThemeRegistry Extends DrupalCacheArray {
     // are not registered, just check the existence of the key in the registry.
     // Use array_key_exists() here since a NULL value indicates that the theme
     // hook exists but has not yet been requested.
-    return array_key_exists($offset, $this->storage);
+    return isset($this->storage[$offset]) || array_key_exists($offset, $this->storage);
   }
 
   public function offsetGet($offset) {
diff --git a/misc/autocomplete.js b/misc/autocomplete.js
index 09ceeec0f14..5c8b57be46d 100644
--- a/misc/autocomplete.js
+++ b/misc/autocomplete.js
@@ -17,7 +17,7 @@ Drupal.behaviors.autocomplete = {
       $($input[0].form).submit(Drupal.autocompleteSubmit);
       $input.parent()
         .attr('role', 'application')
-        .append($('<span class="element-invisible" aria-live="assertive"></span>')
+        .append($('<span class="element-invisible" aria-live="assertive" aria-atomic="true"></span>')
           .attr('id', $input.attr('id') + '-autocomplete-aria-live')
         );
       new Drupal.jsAC($input, acdb[uri]);
diff --git a/modules/field/field.form.inc b/modules/field/field.form.inc
index 280f778ffba..1d5a632b1ab 100644
--- a/modules/field/field.form.inc
+++ b/modules/field/field.form.inc
@@ -213,14 +213,25 @@ function field_multiple_value_form($field, $instance, $langcode, $items, &$form,
         '#language' => $langcode,
         '#field_parents' => $parents,
         '#columns' => array_keys($field['columns']),
-        // For multiple fields, title and description are handled by the wrapping table.
-        '#title' => $multiple ? '' : $title,
-        '#description' => $multiple ? '' : $description,
+        '#title' => $title,
+        '#description' => $description,
         // Only the first widget should be required.
         '#required' => $delta == 0 && $instance['required'],
         '#delta' => $delta,
         '#weight' => $delta,
       );
+      // For multiple fields, title and description are handled by the wrapping
+      // table.
+      if ($multiple) {
+        if ($delta == 0) {
+          $element['#title'] = $title;
+        }
+        else {
+          $element['#title'] = t('!title (value @number)', array('@number' => $delta + 1, '!title' => $title));
+        }
+        $element['#title_display'] = 'invisible';
+        $element['#description'] = '';
+      }
       if ($element = $function($form, $form_state, $field, $instance, $langcode, $items, $delta, $element)) {
         // Input field for the delta (drag-n-drop reordering).
         if ($multiple) {
diff --git a/modules/field/tests/field.test b/modules/field/tests/field.test
index adf2413ba7b..5312f2d4557 100644
--- a/modules/field/tests/field.test
+++ b/modules/field/tests/field.test
@@ -1810,6 +1810,27 @@ class FieldFormTestCase extends FieldTestCase {
     // Test with several multiple fields in a form
   }
 
+  /**
+   * Tests the position of the required label.
+   */
+  public function testFieldFormUnlimitedRequired() {
+    $this->field = $this->field_unlimited;
+    $this->field_name = $this->field['field_name'];
+    $this->instance['field_name'] = $this->field_name;
+    $this->instance['required'] = TRUE;
+    field_create_field($this->field);
+    field_create_instance($this->instance);
+
+    // Display creation form -> 1 widget.
+    $this->drupalGet('test-entity/add/test-bundle');
+    $result = $this->xpath("//label[not(contains(@class, 'element-invisible')) and contains(text(), :label)]/span/text()", array(':label' => $this->instance['label']));
+    $this->assertEqual($result[0], '*', 'Required symbol added to field label.');
+    // Check that the label of the field input is visually hidden and contains
+    // the field title and an indication of the delta for a11y.
+    $result = $this->xpath("//label[contains(@class, 'element-invisible') and contains(text(), :label)]/span/text()", array(':label' => $this->instance['label']));
+    $this->assertEqual($result[0], '*', 'Required symbol and field label are visually hidden.');
+  }
+
   /**
    * Tests widget handling of multiple required radios.
    */
diff --git a/modules/menu/menu.admin.inc b/modules/menu/menu.admin.inc
index a24703c9fcd..4d0a792dda0 100644
--- a/modules/menu/menu.admin.inc
+++ b/modules/menu/menu.admin.inc
@@ -59,6 +59,9 @@ function menu_overview_form($form, &$form_state, $menu) {
   foreach ($result as $item) {
     $links[] = $item;
   }
+  $link_count = db_query("SELECT COUNT(*) AS counter FROM {menu_links} WHERE menu_name = :menu AND link_path NOT LIKE :link_path", array(':menu' => $menu['menu_name'], ':link_path' => '%\%%'))->fetchObject();
+  $counter = intval($link_count->counter / 2 ) + 1;
+
   $tree = menu_tree_data($links);
   $node_links = array();
   menu_tree_collect_node_links($tree, $node_links);
@@ -67,7 +70,8 @@ function menu_overview_form($form, &$form_state, $menu) {
   menu_tree_check_access($tree, $node_links);
   $menu_admin = FALSE;
 
-  $form = array_merge($form, _menu_overview_tree_form($tree));
+  $delta = _menu_get_menu_weight_delta($menu['menu_name'], $counter);
+  $form = array_merge($form, _menu_overview_tree_form($tree, $delta));
   $form['#menu'] =  $menu;
 
   if (element_children($form)) {
@@ -88,8 +92,10 @@ function menu_overview_form($form, &$form_state, $menu) {
  *
  * @param $tree
  *   The menu_tree retrieved by menu_tree_data.
+ * @param $delta
+ *   The number of items to use in the menu weight selector. Defaults to 50.
  */
-function _menu_overview_tree_form($tree) {
+function _menu_overview_tree_form($tree, $delta = 50) {
   $form = &drupal_static(__FUNCTION__, array('#tree' => TRUE));
   foreach ($tree as $data) {
     $title = '';
@@ -100,12 +106,7 @@ function _menu_overview_tree_form($tree) {
       $form[$mlid]['#item'] = $item;
       $form[$mlid]['#attributes'] = $item['hidden'] ? array('class' => array('menu-disabled')) : array('class' => array('menu-enabled'));
       $form[$mlid]['title']['#markup'] = l($item['title'], $item['href'], $item['localized_options']);
-      if ($item['hidden']) {
-        $form[$mlid]['title']['#markup'] .= ' (' . t('disabled') . ')';
-      }
-      elseif ($item['link_path'] == 'user' && $item['module'] == 'system') {
-        $form[$mlid]['title']['#markup'] .= ' (' . t('logged in users only') . ')';
-      }
+      menu_add_link_labels($form[$mlid]['title']['#markup'], $item);
 
       $form[$mlid]['hidden'] = array(
         '#type' => 'checkbox',
@@ -115,7 +116,7 @@ function _menu_overview_tree_form($tree) {
       );
       $form[$mlid]['weight'] = array(
         '#type' => 'weight',
-        '#delta' => 50,
+        '#delta' => $delta,
         '#default_value' => $item['weight'],
         '#title_display' => 'invisible',
         '#title' => t('Weight for @title', array('@title' => $item['title'])),
@@ -143,7 +144,7 @@ function _menu_overview_tree_form($tree) {
     }
 
     if ($data['below']) {
-      _menu_overview_tree_form($data['below']);
+      _menu_overview_tree_form($data['below'], $delta);
     }
   }
   return $form;
@@ -358,10 +359,22 @@ function menu_edit_item($form, &$form_state, $type, $item, $menu) {
     '#description' => t('The maximum depth for a link and all its children is fixed at !maxdepth. Some menu links may not be available as parents if selecting them would exceed this limit.', array('!maxdepth' => MENU_MAX_DEPTH)),
     '#attributes' => array('class' => array('menu-title-select')),
   );
+  // Get number of items in all possible parent menus so the weight selector is
+  // sized appropriately.
+  $menu_names = array_keys(menu_get_menus());
+  $menu_options = array();
+  foreach ($menu_names as $menu_name) {
+    if (isset($options[$menu_name . ':0'])) {
+      $menu_options[] = $menu_name;
+    }
+  }
+  // Make sure that we always have values in menu_options.
+  $menu_options = !empty($menu_options) ? $menu_options : $menu_names;
+
   $form['weight'] = array(
     '#type' => 'weight',
     '#title' => t('Weight'),
-    '#delta' => 50,
+    '#delta' => _menu_get_menu_weight_delta($menu_options),
     '#default_value' => $item['weight'],
     '#description' => t('Optional. In the menu, the heavier links will sink and the lighter links will be positioned nearer the top.'),
   );
diff --git a/modules/menu/menu.module b/modules/menu/menu.module
index 27b1675a39e..9578f59271f 100644
--- a/modules/menu/menu.module
+++ b/modules/menu/menu.module
@@ -401,6 +401,9 @@ function menu_parent_options_js() {
  * Helper function to get the items of the given menu.
  */
 function _menu_get_options($menus, $available_menus, $item) {
+  global $menu_admin;
+  $menu_admin = TRUE;
+
   // If the item has children, there is an added limit to the depth of valid parents.
   if (isset($item['parent_depth_limit'])) {
     $limit = $item['parent_depth_limit'];
@@ -417,6 +420,8 @@ function _menu_get_options($menus, $available_menus, $item) {
       _menu_parents_recurse($tree, $menu_name, '--', $options, $item['mlid'], $limit);
     }
   }
+
+  $menu_admin = FALSE;
   return $options;
 }
 
@@ -431,9 +436,7 @@ function _menu_parents_recurse($tree, $menu_name, $indent, &$options, $exclude,
     }
     if ($data['link']['mlid'] != $exclude && $data['link']['hidden'] >= 0) {
       $title = $indent . ' ' . truncate_utf8($data['link']['title'], 30, TRUE, FALSE);
-      if ($data['link']['hidden']) {
-        $title .= ' (' . t('disabled') . ')';
-      }
+      menu_add_link_labels($title, $data['link']);
       $options[$menu_name . ':' . $data['link']['mlid']] = $title;
       if ($data['below']) {
         _menu_parents_recurse($data['below'], $menu_name, $indent . '--', $options, $exclude, $depth_limit);
@@ -442,6 +445,27 @@ function _menu_parents_recurse($tree, $menu_name, $indent, &$options, $exclude,
   }
 }
 
+/**
+ * Adds labels to the title of a hidden, unpublished or logged-in menu link.
+ *
+ * @param string $title
+ *   The title of the menu link. This will be modified as necessary to add the
+ *   appropriate label in parentheses at the end.
+ * @param array $item
+ *   An array representing the menu link item.
+ */
+function menu_add_link_labels(&$title, $item) {
+  if ($item['hidden']) {
+    $title .= ' (' . t('disabled') . ')';
+  }
+  elseif (!empty($item['node_unpublished'])) {
+    $title .= ' (' . t('unpublished') . ')';
+  }
+  elseif ($item['link_path'] == 'user' && $item['module'] == 'system') {
+    $title .= ' (' . t('logged in users only') . ')';
+  }
+}
+
 /**
  * Reset a system-defined menu link.
  */
@@ -616,6 +640,39 @@ function _menu_parent_depth_limit($item) {
   return MENU_MAX_DEPTH - 1 - (($item['mlid'] && $item['has_children']) ? menu_link_children_relative_depth($item) : 0);
 }
 
+/**
+ * Calculate the delta for the weight element for a given set of menus.
+ *
+ * @param string|array $menu_names
+ *   Menu name or an array of menu names.
+ * @param int $max_delta
+ *   Optional maximum value.
+ *
+ * @return int
+ *   Delta value.
+ */
+function _menu_get_menu_weight_delta($menu_names, $max_delta = NULL) {
+
+  if (is_string($menu_names)) {
+    $menu_names = array($menu_names);
+  }
+
+  $weight_info = db_query("SELECT MAX(weight) AS max_weight, MIN(weight) as min_weight FROM {menu_links} WHERE menu_name IN (:menu_names)", array(':menu_names' => $menu_names))->fetchObject();
+
+  $delta = max(abs($weight_info->min_weight), abs($weight_info->max_weight)) + 1;
+
+  // Honor max param, if given.
+  if (!is_null($max_delta) && $delta > $max_delta) {
+    $delta = $max_delta;
+  }
+
+  // Provide a minimum.
+  if ($delta < 50) {
+    $delta = 50;
+  }
+  return $delta;
+}
+
 /**
  * Implements hook_form_BASE_FORM_ID_alter().
  *
@@ -702,10 +759,22 @@ function menu_form_node_form_alter(&$form, $form_state) {
     '#options' => $options,
     '#attributes' => array('class' => array('menu-parent-select')),
   );
+  // Get number of items in all possible parent menus so the weight selector is
+  // sized appropriately.
+  $menu_names = array_keys(menu_get_menus());
+  $menu_options = array();
+  foreach ($menu_names as $menu_name) {
+    if (isset($options[$menu_name . ':0'])) {
+      $menu_options[] = $menu_name;
+    }
+  }
+  // Make sure that we always have values in menu_options.
+  $menu_options = !empty($menu_options) ? $menu_options : $menu_names;
+
   $form['menu']['link']['weight'] = array(
     '#type' => 'weight',
     '#title' => t('Weight'),
-    '#delta' => 50,
+    '#delta' => _menu_get_menu_weight_delta($menu_options),
     '#default_value' => $link['weight'],
     '#description' => t('Menu links with smaller weights are displayed before links with larger weights.'),
   );
diff --git a/modules/menu/menu.test b/modules/menu/menu.test
index bb792ee8edf..e1a7f3fbfe4 100644
--- a/modules/menu/menu.test
+++ b/modules/menu/menu.test
@@ -222,6 +222,14 @@ class MenuTestCase extends DrupalWebTestCase {
     $this->assertMenuLink($item2['mlid'], array('depth' => 2, 'has_children' => 1, 'p1' => $item1['mlid'], 'p2' => $item2['mlid'], 'p3' => 0));
     $this->assertMenuLink($item3['mlid'], array('depth' => 3, 'has_children' => 0, 'p1' => $item1['mlid'], 'p2' => $item2['mlid'], 'p3' => $item3['mlid'], 'p4' => 0));
 
+    // Add 102 menu links with increasing weights, then make sure the last-added
+    // item's weight doesn't get changed because of the old hardcoded delta = 50
+    $items = array();
+    for ($i = -50; $i <= 51; $i++) {
+      $items[$i] = $this->addMenuLink(0, 'node/' . $node1->nid, $menu_name, TRUE, strval($i));
+    }
+    $this->assertMenuLink($items[51]['mlid'], array('weight' => '51'));
+
     // Verify menu links.
     $this->verifyMenuLink($item1, $node1);
     $this->verifyMenuLink($item2, $node2, $item1, $node1);
@@ -286,15 +294,37 @@ class MenuTestCase extends DrupalWebTestCase {
     $this->assertFieldByName('link_path', $path, 'Path no longer has query or fragment.');
   }
 
+  /**
+   * Tries to use the navigation menu as the source for secondary links.
+   */
+  function testNavigationAsSecondaryMenu() {
+    $this->drupalLogin($this->big_user);
+
+    // Go to the menu settings page and make the navigation the source for the
+    // secondary menu.
+    $edit = array(
+      'menu_main_links_source' => 'main-menu',
+      'menu_secondary_links_source' => 'navigation',
+    );
+    $this->drupalGet('admin/structure/menu/settings');
+    $this->drupalPost(NULL, $edit, t('Save configuration'));
+
+    // Now visit the user page. There should be an 'Add content' link in the
+    // navigation block and one in the secondary menu.
+    $this->drupalGet('user');
+    $this->assertNoUniqueText(t('Add content'));
+  }
+
   /**
    * Add a menu link using the menu module UI.
    *
    * @param integer $plid Parent menu link id.
    * @param string $link Link path.
    * @param string $menu_name Menu name.
+   * @param string $weight Menu link weight
    * @return array Menu link created.
    */
-  function addMenuLink($plid = 0, $link = '<front>', $menu_name = 'navigation', $expanded = TRUE) {
+  function addMenuLink($plid = 0, $link = '<front>', $menu_name = 'navigation', $expanded = TRUE, $weight = '0') {
     // View add menu link page.
     $this->drupalGet("admin/structure/menu/manage/$menu_name/add");
     $this->assertResponse(200);
@@ -307,7 +337,7 @@ class MenuTestCase extends DrupalWebTestCase {
       'enabled' => TRUE, // Use this to disable the menu and test.
       'expanded' => $expanded, // Setting this to true should test whether it works when we do the std_user tests.
       'parent' =>  $menu_name . ':' . $plid,
-      'weight' => '0',
+      'weight' => $weight,
     );
 
     // Add menu link.
@@ -604,6 +634,50 @@ class MenuTestCase extends DrupalWebTestCase {
       $this->assertText(t('Menus'), 'Add menu node was displayed');
     }
   }
+
+  /**
+   * Tests that menu admin lists can include menu items for unpublished nodes.
+   */
+  function testUnpublishedNodeMenuItem() {
+    // Log in as an administrator who can view unpublished nodes.
+    $menu_and_node_admin_user = $this->drupalCreateUser(array(
+      'bypass node access',
+      'administer menu',
+    ));
+    $this->drupalLogin($menu_and_node_admin_user);
+
+    // Create an unpublished node with a menu link.
+    $title = $this->randomName();
+    $node = $this->drupalCreateNode(array(
+      'type' => 'article',
+      'title' => $title,
+      'status' => NODE_NOT_PUBLISHED,
+    ));
+    $edit = array(
+      'link_path' => 'node/' . $node->nid,
+      'link_title' => $title,
+      'description' => '',
+      'enabled' => TRUE,
+      'expanded' => TRUE,
+      'parent' => 'navigation:0',
+      'weight' => '0',
+    );
+    $this->drupalPost('admin/structure/menu/manage/navigation/add', $edit, t('Save'));
+
+    // Verify that the administrator can see the menu link (with a label
+    // indicating that it is unpublished) on the menu management page.
+    $this->drupalGet('admin/structure/menu/manage/navigation');
+    $this->assertText($title . ' (unpublished)', 'Menu link to unpublished node is visible to users with "bypass node access" permission.');
+
+    // Verify that a user who cannot view unpublished nodes does not see the
+    // menu link on the menu management page.
+    $menu_admin_user = $this->drupalCreateUser(array('administer menu'));
+    $this->drupalLogin($menu_admin_user);
+    $this->drupalGet('admin/structure/menu/manage/navigation');
+    $this->assertResponse(200);
+    $this->assertNoText($title, 'Menu link to unpublished node is not visible to users without the "bypass node access" permission.');
+  }
+
 }
 
 /**
@@ -758,4 +832,5 @@ class MenuNodeTestCase extends DrupalWebTestCase {
     $options = $this->xpath('//select[@id=:id]//option[@value=:option]', array(':id' => $id, ':option' => $option));
     return $this->assertTrue(isset($selects[0]) && !isset($options[0]), $message ? $message : t('Option @option for field @id does not exist.', array('@option' => $option, '@id' => $id)), t('Browser'));
   }
+
 }
diff --git a/modules/node/content_types.inc b/modules/node/content_types.inc
index c451dc7e03f..446da7d69e1 100644
--- a/modules/node/content_types.inc
+++ b/modules/node/content_types.inc
@@ -417,14 +417,16 @@ function node_type_delete_confirm($form, &$form_state, $type) {
   $form['name'] = array('#type' => 'value', '#value' => $type->name);
 
   $message = t('Are you sure you want to delete the content type %type?', array('%type' => $type->name));
-  $caption = '';
 
   $num_nodes = db_query("SELECT COUNT(*) FROM {node} WHERE type = :type", array(':type' => $type->type))->fetchField();
   if ($num_nodes) {
-    $caption .= '<p>' . format_plural($num_nodes, '%type is used by 1 piece of content on your site. If you remove this content type, you will not be able to edit the %type content and it may not display correctly.', '%type is used by @count pieces of content on your site. If you remove %type, you will not be able to edit the %type content and it may not display correctly.', array('%type' => $type->name)) . '</p>';
+    drupal_set_title($message, PASS_THROUGH);
+    $caption = '<p>' . format_plural($num_nodes, '%type is used by 1 piece of content on your site. You cannot remove this content type until you have removed all of the %type content.', '%type is used by @count pieces of content on your site. You cannot remove this content type until you have removed all of the %type content.', array('%type' => $type->name)) . '</p>';
+    $form['description'] = array('#markup' => $caption);
+    return $form;
   }
 
-  $caption .= '<p>' . t('This action cannot be undone.') . '</p>';
+  $caption = '<p>' . t('This action cannot be undone.') . '</p>';
 
   return confirm_form($form, $message, 'admin/structure/types', $caption, t('Delete'));
 }
diff --git a/modules/node/node.module b/modules/node/node.module
index 1c0e518696b..cf41ce7145e 100644
--- a/modules/node/node.module
+++ b/modules/node/node.module
@@ -3055,18 +3055,12 @@ function node_access($op, $node, $account = NULL) {
       $query->condition($nids);
       $query->range(0, 1);
 
-      $grants = db_or();
-      foreach (node_access_grants($op, $account) as $realm => $gids) {
-        foreach ($gids as $gid) {
-          $grants->condition(db_and()
-            ->condition('gid', $gid)
-            ->condition('realm', $realm)
-          );
-        }
-      }
+      $grants = node_add_node_grants_to_query(node_access_grants($op, $account));
+
       if (count($grants) > 0) {
         $query->condition($grants);
       }
+
       $result =  (bool) $query
         ->execute()
         ->fetchField();
@@ -3084,6 +3078,31 @@ function node_access($op, $node, $account = NULL) {
   return FALSE;
 }
 
+/**
+ * Helper function to create the or condition for a node grants check.
+ *
+ * @param $account
+ *   The grants to add to the query, usually gotten via node_access_grants().
+ * @param $table_alias
+ *   Optional, the alias to the node access table.
+ *
+ * @return
+ *   TRUE if the operation may be performed, FALSE otherwise.
+ */
+function node_add_node_grants_to_query($node_access_grants, $table_alias = '') {
+  $grants = db_or();
+  $prefix = $table_alias ? $table_alias . '.' : '';
+  foreach ($node_access_grants as $realm => $gids) {
+    if (!empty($gids)) {
+      $grants->condition(db_and()
+        ->condition($prefix . 'gid', $gids, 'IN')
+        ->condition($prefix . 'realm', $realm)
+      );
+    }
+  }
+  return $grants;
+}
+
 /**
  * Implements hook_node_access().
  */
@@ -3252,15 +3271,8 @@ function node_access_view_all_nodes($account = NULL) {
       ->condition('nid', 0)
       ->condition('grant_view', 1, '>=');
 
-    $grants = db_or();
-    foreach (node_access_grants('view', $account) as $realm => $gids) {
-      foreach ($gids as $gid) {
-        $grants->condition(db_and()
-          ->condition('gid', $gid)
-          ->condition('realm', $realm)
-        );
-      }
-    }
+    $grants = node_add_node_grants_to_query(node_access_grants('view', $account));
+
     if (count($grants) > 0 ) {
       $query->condition($grants);
     }
@@ -3422,17 +3434,7 @@ function _node_query_node_access_alter($query, $type) {
       $subquery = db_select('node_access', 'na')
        ->fields('na', array('nid'));
 
-      $grant_conditions = db_or();
-      // If any grant exists for the specified user, then user has access
-      // to the node for the specified operation.
-      foreach ($grants as $realm => $gids) {
-        foreach ($gids as $gid) {
-          $grant_conditions->condition(db_and()
-            ->condition('na.gid', $gid)
-            ->condition('na.realm', $realm)
-          );
-        }
-      }
+      $grant_conditions = node_add_node_grants_to_query($grants, 'na');
 
       // Attach conditions to the subquery for nodes.
       if (count($grant_conditions->conditions())) {
diff --git a/modules/node/node.test b/modules/node/node.test
index e8eb459e3bb..f0ff8e7d6e5 100644
--- a/modules/node/node.test
+++ b/modules/node/node.test
@@ -1614,6 +1614,48 @@ class NodeTypeTestCase extends DrupalWebTestCase {
       $this->assertTrue(isset($types[$type]->disabled) && empty($types[$type]->disabled), format_string('%type type is enabled.', array('%type' => $type)));
     }
   }
+
+  /**
+   * Tests deleting a content type that still has content.
+   */
+  function testNodeTypeDeletion() {
+    // Create a content type programmatically.
+    $type = $this->drupalCreateContentType();
+
+    // Log in a test user.
+    $web_user = $this->drupalCreateUser(array(
+      'bypass node access',
+      'administer content types',
+    ));
+    $this->drupalLogin($web_user);
+
+    // Add a new node of this type.
+    $node = $this->drupalCreateNode(array('type' => $type->type));
+    // Attempt to delete the content type, which should not be allowed.
+    $this->drupalGet('admin/structure/types/manage/' . $type->name . '/delete');
+    $this->assertRaw(
+      t(
+        '%type is used by 1 piece of content on your site. You cannot remove this content type until you have removed all of the %type content.',
+        array('%type' => $type->name)
+      ),
+      'The content type will not be deleted until all nodes of that type are removed.'
+    );
+    $this->assertNoText(t('This action cannot be undone.'), 'The node type deletion confirmation form is not available.');
+
+    // Delete the node.
+    node_delete($node->nid);
+    // Attempt to delete the content type, which should now be allowed.
+    $this->drupalGet('admin/structure/types/manage/' . $type->name . '/delete');
+    $this->assertRaw(
+      t(
+        'Are you sure you want to delete the content type %type?',
+        array('%type' => $type->name)
+      ),
+      'The content type is available for deletion.'
+    );
+    $this->assertText(t('This action cannot be undone.'), 'The node type deletion confirmation form is available.');
+  }
+
 }
 
 /**
diff --git a/modules/path/path.admin.inc b/modules/path/path.admin.inc
index 28b06189b36..248971f4f7c 100644
--- a/modules/path/path.admin.inc
+++ b/modules/path/path.admin.inc
@@ -11,7 +11,11 @@
  * When filter key passed, perform a standard search on the given key,
  * and return the list of matching URL aliases.
  */
-function path_admin_overview($keys = NULL) {
+function path_admin_overview() {
+  // Get search keys.
+  $args = func_get_args();
+  $keys = implode('/', $args);
+
   // Add the filter form above the overview table.
   $build['path_admin_filter_form'] = drupal_get_form('path_admin_filter_form', $keys);
   // Enable language column if locale is enabled or if we have any alias with language
diff --git a/modules/path/path.test b/modules/path/path.test
index f6131ce62bf..57882518273 100644
--- a/modules/path/path.test
+++ b/modules/path/path.test
@@ -107,6 +107,55 @@ class PathTestCase extends DrupalWebTestCase {
     $this->drupalGet($edit['alias']);
     $this->assertNoText($node1->title, 'Alias was successfully deleted.');
     $this->assertResponse(404);
+
+    // Create third and fourth test node.
+    $node3 = $this->drupalCreateNode();
+    $node4 = $this->drupalCreateNode();
+
+    // Give the node aliases a common first part.
+    $name = $this->randomName(4);
+
+    // Create aliases containing a slash.
+    $edit = array();
+    $edit['source'] = 'node/' . $node3->nid;
+    $alias3 = $name . '/' . $this->randomName(5);
+    $edit['alias'] = $alias3;
+    $this->drupalPost('admin/config/search/path/add', $edit, t('Save'));
+    $edit['source'] = 'node/' . $node4->nid;
+    $alias4 = $name . '/' . $this->randomName(4);
+    $edit['alias'] = $alias4;
+    $this->drupalPost('admin/config/search/path/add', $edit, t('Save'));
+
+    // Confirm that the aliases work.
+    $this->drupalGet($alias3);
+    $this->assertText($node3->title, 'Alias works.');
+    $this->assertResponse(200);
+    $this->drupalGet($alias4);
+    $this->assertText($node4->title, 'Alias works.');
+    $this->assertResponse(200);
+
+    // Confirm that filters containing slashes work.
+    $this->drupalGet('admin/config/search/path/list/' . $alias3);
+    $this->assertFieldByName('filter', $alias3);
+    $this->assertText($alias3, 'Searched-for alias with slash found.');
+    $this->assertNoText($alias4, 'Different alias with slash not found.');
+    $this->assertResponse(200);
+
+    // Delete aliases.
+    $pid = $this->getPID($alias3);
+    $this->drupalPost('admin/config/search/path/edit/' . $pid, array(), t('Delete'));
+    $this->drupalPost(NULL, array(), t('Confirm'));
+    $pid = $this->getPID($alias4);
+    $this->drupalPost('admin/config/search/path/edit/' . $pid, array(), t('Delete'));
+    $this->drupalPost(NULL, array(), t('Confirm'));
+
+    // Confirm that the aliases no longer work.
+    $this->drupalGet($alias3);
+    $this->assertNoText($node3->title, 'Alias was successfully deleted.');
+    $this->assertResponse(404);
+    $this->drupalGet($alias4);
+    $this->assertNoText($node4->title, 'Alias was successfully deleted.');
+    $this->assertResponse(404);
   }
 
   /**
diff --git a/modules/simpletest/drupal_web_test_case.php b/modules/simpletest/drupal_web_test_case.php
index f212b0eb534..e2dc2322def 100644
--- a/modules/simpletest/drupal_web_test_case.php
+++ b/modules/simpletest/drupal_web_test_case.php
@@ -51,6 +51,20 @@ abstract class DrupalTestCase {
    */
   protected $timeLimit = 500;
 
+  /**
+   * Whether to cache the installation part of the setUp() method.
+   *
+   * @var bool
+   */
+  public $useSetupInstallationCache = FALSE;
+
+  /**
+   * Whether to cache the modules installation part of the setUp() method.
+   *
+   * @var bool
+   */
+  public $useSetupModulesCache = FALSE;
+
   /**
    * Current results of this test case.
    *
@@ -1448,6 +1462,159 @@ protected function prepareEnvironment() {
     $this->setupEnvironment = TRUE;
   }
 
+  /**
+   * Copies the cached tables and files for a cached installation setup.
+   *
+   * @param string $cache_key_prefix
+   *   (optional) Additional prefix for the cache key.
+   *
+   * @return bool
+   *   TRUE when the cache was usable and loaded, FALSE when cache was not
+   *   available.
+   *
+   * @see DrupalWebTestCase::setUp()
+   */
+  protected function loadSetupCache($cache_key_prefix = '') {
+    $cache_key = $this->getSetupCacheKey($cache_key_prefix);
+    $cache_file = $this->originalFileDirectory . '/simpletest/' . $cache_key . '/simpletest-cache-setup';
+
+    if (file_exists($cache_file)) {
+      return $this->copySetupCache($cache_key, substr($this->databasePrefix, 10));
+    }
+
+    return FALSE;
+  }
+
+  /**
+   * Returns the cache key used for the setup caching.
+   *
+   * @param string $cache_key_prefix
+   *   (optional) Additional prefix for the cache key.
+   *
+   * @return string
+   *   The cache key to use, by default only based on the profile used by the
+   *   test.
+   */
+  protected function getSetupCacheKey($cache_key_prefix = '') {
+    // The cache key needs to start with a numeric character, so that the cached
+    // installation gets cleaned up properly.
+    $cache_key_prefix = hash('crc32b', $cache_key_prefix . $this->profile);
+    return '1c' . $cache_key_prefix;
+  }
+
+  /**
+   * Store the installation setup to a cache.
+   *
+   * @param string $cache_key_prefix
+   *   (optional) Additional prefix for the cache key.
+   *
+   * @return bool
+   *   TRUE if the installation was stored in the cache, FALSE otherwise.
+   */
+  protected function storeSetupCache($cache_key_prefix = '') {
+    $cache_key = $this->getSetupCacheKey($cache_key_prefix);
+    $lock_key = 'simpletest_store_cache_' . $cache_key . '_' . $this->testId;
+
+    // All concurrent tests share the same test id. Therefore it is possible to
+    // use the lock to ensure that only one process will store the cache. This
+    // is important as else DB tables created by one process could be deleted
+    // by another as the cache copying is idempotent.
+    if (! lock_acquire($lock_key)) {
+      return FALSE;
+    }
+
+    // Try to copy the installation to the setup cache - now that we have a
+    // lock to do so.
+    if (!$this->copySetupCache(substr($this->databasePrefix, 10), $cache_key)) {
+      // It is non-fatal if the cache cannot be copied as the next test run
+      // will try it again.
+      $this->assert('debug', t('Storing cache with key @key failed', array('@key' => $cache_key)), 'storeSetupCache');
+
+      lock_release($lock_key);
+      return FALSE;
+    }
+
+    // Inform others that this cache is usable now.
+    $cache_file = $this->originalFileDirectory . '/simpletest/' . $cache_key . '/simpletest-cache-setup';
+    file_put_contents($cache_file, time(NULL));
+
+    lock_release($lock_key);
+    return TRUE;
+  }
+
+  /**
+   * Copy the setup cache from/to another table and files directory.
+   *
+   * @param string $from
+   *   The prefix_id / cache_key from where to copy.
+   * @param string $to
+   *   The prefix_id / cache_key to where to copy.
+   *
+   * @return bool
+   *   TRUE if the setup cache was copied to the current installation, FALSE
+   *   otherwise.
+   */
+  protected function copySetupCache($from, $to) {
+    $from_prefix = 'simpletest' . $from;
+    $to_prefix = 'simpletest' . $to;
+
+    try {
+       $tables = db_query("SHOW TABLES LIKE :prefix", array(':prefix' => db_like($from_prefix) . '%' ))->fetchCol();
+
+       if (count($tables) == 0) {
+         return FALSE;
+       }
+
+       foreach ($tables as $from_table) {
+         $table = substr($from_table, strlen($from_prefix));
+         $to_table = $to_prefix . $table;
+
+         // Remove the table in case the copying process was interrupted.
+         db_query('DROP TABLE IF EXISTS ' . $to_table);
+         db_query('CREATE TABLE ' . $to_table . ' LIKE ' . $from_table);
+         db_query('ALTER TABLE ' . $to_table . ' DISABLE KEYS');
+         db_query('INSERT ' . $to_table . ' SELECT * FROM ' . $from_table);
+         db_query('ALTER TABLE ' . $to_table . ' ENABLE KEYS');
+       }
+    }
+    catch (Exception $e) {
+      return FALSE;
+    }
+
+    $from_dir = $this->originalFileDirectory . '/simpletest/' . $from;
+    $to_dir = $this->originalFileDirectory . '/simpletest/' . $to;
+    $this->recursiveDirectoryCopy($from_dir, $to_dir);
+
+    return TRUE;
+  }
+
+  /**
+   * Recursively copy one directory to another.
+   *
+   * @param $src
+   *   The source directory.
+   * @param $dest
+   *   The destination directory.
+   */
+  protected function recursiveDirectoryCopy($src, $dst) {
+    $dir = opendir($src);
+
+    if (!file_exists($dst)){
+      mkdir($dst);
+    }
+    while (($file = readdir($dir)) !== FALSE) {
+      if ($file != '.' && $file != '..') {
+        if (is_dir($src . '/' . $file)) {
+          $this->recursiveDirectoryCopy($src . '/' . $file, $dst . '/' . $file);
+        }
+        else {
+          copy($src . '/' . $file, $dst . '/' . $file);
+        }
+      }
+    }
+    closedir($dir);
+  }
+
   /**
    * Sets up a Drupal site for running functional and integration tests.
    *
@@ -1501,57 +1668,108 @@ protected function setUp() {
     // profile's hook_install() and other hook implementations are never invoked.
     $conf['install_profile'] = $this->profile;
 
-    // Perform the actual Drupal installation.
-    include_once DRUPAL_ROOT . '/includes/install.inc';
-    drupal_install_system();
+    $has_installation_cache = FALSE;
+    $has_modules_cache = FALSE;
 
-    $this->preloadRegistry();
+    if ($this->useSetupModulesCache) {
+      $modules = func_get_args();
+      // Modules can be either one parameter or multiple.
+      if (isset($modules[0]) && is_array($modules[0])) {
+        $modules = $modules[0];
+      }
+      $modules = array_unique($modules);
+      sort($modules);
 
-    // Set path variables.
-    variable_set('file_public_path', $this->public_files_directory);
-    variable_set('file_private_path', $this->private_files_directory);
-    variable_set('file_temporary_path', $this->temp_files_directory);
+      $modules_cache_key_prefix = hash('crc32b', serialize($modules)) . '_';
+      $has_modules_cache = $this->loadSetupCache($modules_cache_key_prefix);
+    }
 
-    // Set the 'simpletest_parent_profile' variable to add the parent profile's
-    // search path to the child site's search paths.
-    // @see drupal_system_listing()
-    // @todo This may need to be primed like 'install_profile' above.
-    variable_set('simpletest_parent_profile', $this->originalProfile);
+    if (!$has_modules_cache && $this->useSetupInstallationCache) {
+      $has_installation_cache = $this->loadSetupCache();
+    }
 
-    // Include the testing profile.
-    variable_set('install_profile', $this->profile);
-    $profile_details = install_profile_info($this->profile, 'en');
+    if ($has_modules_cache || $has_installation_cache) {
+      // Reset path variables.
+      variable_set('file_public_path', $this->public_files_directory);
+      variable_set('file_private_path', $this->private_files_directory);
+      variable_set('file_temporary_path', $this->temp_files_directory);
+      $this->refreshVariables();
 
-    // Install the modules specified by the testing profile.
-    module_enable($profile_details['dependencies'], FALSE);
+      // Load all enabled modules
+      module_load_all();
 
-    // Install modules needed for this test. This could have been passed in as
-    // either a single array argument or a variable number of string arguments.
-    // @todo Remove this compatibility layer in Drupal 8, and only accept
-    // $modules as a single array argument.
-    $modules = func_get_args();
-    if (isset($modules[0]) && is_array($modules[0])) {
-      $modules = $modules[0];
-    }
-    if ($modules) {
-      $success = module_enable($modules, TRUE);
-      $this->assertTrue($success, t('Enabled modules: %modules', array('%modules' => implode(', ', $modules))));
+      $this->pass(t('Using cache: @cache (@key)', array(
+        '@cache' => $has_modules_cache ? t('Modules Cache') : t('Installation Cache'),
+        '@key' => $this->getSetupCacheKey($has_modules_cache ? $modules_cache_key_prefix : ''),
+      )));
     }
+    else {
+      // Perform the actual Drupal installation.
+      include_once DRUPAL_ROOT . '/includes/install.inc';
+      drupal_install_system();
+
+      $this->preloadRegistry();
+
+      // Set path variables.
+      variable_set('file_public_path', $this->public_files_directory);
+      variable_set('file_private_path', $this->private_files_directory);
+      variable_set('file_temporary_path', $this->temp_files_directory);
+
+      // Set the 'simpletest_parent_profile' variable to add the parent profile's
+      // search path to the child site's search paths.
+      // @see drupal_system_listing()
+      // @todo This may need to be primed like 'install_profile' above.
+      variable_set('simpletest_parent_profile', $this->originalProfile);
+
+      // Include the testing profile.
+      variable_set('install_profile', $this->profile);
+      $profile_details = install_profile_info($this->profile, 'en');
+
+      // Install the modules specified by the testing profile.
+      module_enable($profile_details['dependencies'], FALSE);
 
-    // Run the profile tasks.
-    $install_profile_module_exists = db_query("SELECT 1 FROM {system} WHERE type = 'module' AND name = :name", array(
-      ':name' => $this->profile,
-    ))->fetchField();
-    if ($install_profile_module_exists) {
-      module_enable(array($this->profile), FALSE);
+      if ($this->useSetupInstallationCache) {
+        $this->storeSetupCache();
+      }
     }
 
-    // Reset/rebuild all data structures after enabling the modules.
-    $this->resetAll();
+    if (!$has_modules_cache) {
+      // Install modules needed for this test. This could have been passed in as
+      // either a single array argument or a variable number of string arguments.
+      // @todo Remove this compatibility layer in Drupal 8, and only accept
+      // $modules as a single array argument.
+      $modules = func_get_args();
+      if (isset($modules[0]) && is_array($modules[0])) {
+        $modules = $modules[0];
+      }
+      if ($modules) {
+        $success = module_enable($modules, TRUE);
+        $this->assertTrue($success, t('Enabled modules: %modules', array('%modules' => implode(', ', $modules))));
+      }
+
+      // Run the profile tasks.
+      $install_profile_module_exists = db_query("SELECT 1 FROM {system} WHERE type = 'module' AND name = :name", array(
+        ':name' => $this->profile,
+      ))->fetchField();
+      if ($install_profile_module_exists) {
+        module_enable(array($this->profile), FALSE);
+      }
+
+      // Reset/rebuild all data structures after enabling the modules.
+      $this->resetAll();
 
-    // Run cron once in that environment, as install.php does at the end of
-    // the installation process.
-    drupal_cron_run();
+      // Run cron once in that environment, as install.php does at the end of
+      // the installation process.
+      drupal_cron_run();
+
+      if ($this->useSetupModulesCache) {
+        $this->storeSetupCache($modules_cache_key_prefix);
+      }
+    }
+    else {
+      // Reset/rebuild all data structures after enabling the modules.
+      $this->resetAll();
+    }
 
     // Ensure that the session is not written to the new environment and replace
     // the global $user session with uid 1 from the new test site.
diff --git a/modules/simpletest/files/css_test_files/comment_hacks.css b/modules/simpletest/files/css_test_files/comment_hacks.css
index c47e8429ac2..ed8c15c5038 100644
--- a/modules/simpletest/files/css_test_files/comment_hacks.css
+++ b/modules/simpletest/files/css_test_files/comment_hacks.css
@@ -7,6 +7,11 @@
 A large comment block to test for segfaults and speed. This is 60K a's. Extreme but useful to demonstrate flaws in comment striping regexp. aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa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/
 .test1 { display:block;}
 
+/* A pseudo selector with essential whitespace wrapped in quotes. */
+img[style*="float: right"] {
+  padding-left:5px;
+}
+
 /* A multiline IE-mac hack (v.2) taken fron Zen theme*/
 /* Hides from IE-mac \*/
 html .clear-block {
diff --git a/modules/simpletest/files/css_test_files/comment_hacks.css.optimized.css b/modules/simpletest/files/css_test_files/comment_hacks.css.optimized.css
index 1feb8f1bd7d..65823082e73 100644
--- a/modules/simpletest/files/css_test_files/comment_hacks.css.optimized.css
+++ b/modules/simpletest/files/css_test_files/comment_hacks.css.optimized.css
@@ -1 +1 @@
-.test1{display:block;}html .clear-block{height:1%;}.clear-block{display:block;font:italic bold 12px/30px Georgia,serif;}.test2{display:block;}.bkslshv1{background-color:#C00;}.test3{display:block;}.test4{display:block;}.comment-in-double-quotes:before{content:"/* ";}.this_rule_must_stay{color:#F00;background-color:#FFF;}.comment-in-double-quotes:after{content:" */";}.comment-in-single-quotes:before{content:'/*';}.this_rule_must_stay{color:#F00;background-color:#FFF;}.comment-in-single-quotes:after{content:'*/';}.comment-in-mixed-quotes:before{content:'"/*"';}.this_rule_must_stay{color:#F00;background-color:#FFF;}.comment-in-mixed-quotes:after{content:"'*/'";}.comment-in-quotes-with-escaped:before{content:'/* \" \' */';}.this_rule_must_stay{color:#F00;background-color:#FFF;}.comment-in-quotes-with-escaped:after{content:"*/ \" \ '";}
+.test1{display:block;}img[style*="float: right"]{padding-left:5px;}html .clear-block{height:1%;}.clear-block{display:block;font:italic bold 12px/30px Georgia,serif;}.test2{display:block;}.bkslshv1{background-color:#C00;}.test3{display:block;}.test4{display:block;}.comment-in-double-quotes:before{content:"/* ";}.this_rule_must_stay{color:#F00;background-color:#FFF;}.comment-in-double-quotes:after{content:" */";}.comment-in-single-quotes:before{content:'/*';}.this_rule_must_stay{color:#F00;background-color:#FFF;}.comment-in-single-quotes:after{content:'*/';}.comment-in-mixed-quotes:before{content:'"/*"';}.this_rule_must_stay{color:#F00;background-color:#FFF;}.comment-in-mixed-quotes:after{content:"'*/'";}.comment-in-quotes-with-escaped:before{content:'/* \" \' */';}.this_rule_must_stay{color:#F00;background-color:#FFF;}.comment-in-quotes-with-escaped:after{content:"*/ \" \ '";}
diff --git a/modules/simpletest/files/css_test_files/comment_hacks.css.unoptimized.css b/modules/simpletest/files/css_test_files/comment_hacks.css.unoptimized.css
index c47e8429ac2..ed8c15c5038 100644
--- a/modules/simpletest/files/css_test_files/comment_hacks.css.unoptimized.css
+++ b/modules/simpletest/files/css_test_files/comment_hacks.css.unoptimized.css
@@ -7,6 +7,11 @@
 A large comment block to test for segfaults and speed. This is 60K a's. Extreme but useful to demonstrate flaws in comment striping regexp. 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/
 .test1 { display:block;}
 
+/* A pseudo selector with essential whitespace wrapped in quotes. */
+img[style*="float: right"] {
+  padding-left:5px;
+}
+
 /* A multiline IE-mac hack (v.2) taken fron Zen theme*/
 /* Hides from IE-mac \*/
 html .clear-block {
diff --git a/modules/simpletest/files/css_test_files/css_input_without_import.css.optimized.css b/modules/simpletest/files/css_test_files/css_input_without_import.css.optimized.css
index c7bb9dcd17c..e22077a21d7 100644
--- a/modules/simpletest/files/css_test_files/css_input_without_import.css.optimized.css
+++ b/modules/simpletest/files/css_test_files/css_input_without_import.css.optimized.css
@@ -1,4 +1,4 @@
 body{margin:0;padding:0;background:#edf5fa;font:76%/170% Verdana,sans-serif;color:#494949;}.this .is .a .test{font:1em/100% Verdana,sans-serif;color:#494949;}.this
 .is
 .a
-.test{font:1em/100% Verdana,sans-serif;color:#494949;}some :pseudo .thing{-moz-border-radius:3px;-webkit-border-radius:3px;border-radius:3px;filter:progid:DXImageTransform.Microsoft.Shadow(color=#000000,direction='180',strength='10');-ms-filter:"progid:DXImageTransform.Microsoft.Shadow(color=#000000,direction='180',strength='10')";}::-moz-selection{background:#000;color:#fff;}::selection{background:#000;color:#fff;}@media print{*{background:#000 !important;color:#fff !important;}@page{margin:0.5cm;}}@media screen and (max-device-width:480px){background:#000;color:#fff;}textarea,select{font:1em/160% Verdana,sans-serif;color:#494949;}
+.test{font:1em/100% Verdana,sans-serif;color:#494949;}some :pseudo .thing{-moz-border-radius:3px;-webkit-border-radius:3px;border-radius:3px;filter:progid:DXImageTransform.Microsoft.Shadow(color=#000000,direction='180',strength='10');-ms-filter:"progid:DXImageTransform.Microsoft.Shadow(color=#000000, direction='180', strength='10')";}::-moz-selection{background:#000;color:#fff;}::selection{background:#000;color:#fff;}@media print{*{background:#000 !important;color:#fff !important;}@page{margin:0.5cm;}}@media screen and (max-device-width:480px){background:#000;color:#fff;}textarea,select{font:1em/160% Verdana,sans-serif;color:#494949;}
diff --git a/modules/simpletest/files/css_test_files/quotes.css b/modules/simpletest/files/css_test_files/quotes.css
new file mode 100644
index 00000000000..3fe0f7d503f
--- /dev/null
+++ b/modules/simpletest/files/css_test_files/quotes.css
@@ -0,0 +1,31 @@
+/* Example from https://www.w3.org/TR/CSS2/syndata.html#rule-sets */
+q[example="public class foo\
+{\
+    private int x;\
+\
+    foo(int x) {\
+        this.x = x;\
+    }\
+\
+}"] { color: red }
+
+/* A pseudo selector with essential whitespace wrapped in quotes. */
+q[style*="quotes: none"] {
+    quotes: none;
+}
+
+q[style*='quotes: none'] {
+    quotes: none;
+}
+
+q:after {
+    content: ": colon & escaped double \" quotes \".";
+}
+
+q:after {
+    content: ' (brackets & escaped single \' quotes \') ';
+}
+
+q:after {
+    content: "I'm Quote";
+}
diff --git a/modules/simpletest/files/css_test_files/quotes.css.optimized.css b/modules/simpletest/files/css_test_files/quotes.css.optimized.css
new file mode 100644
index 00000000000..716cef729f7
--- /dev/null
+++ b/modules/simpletest/files/css_test_files/quotes.css.optimized.css
@@ -0,0 +1,9 @@
+q[example="public class foo\
+{\
+    private int x;\
+\
+    foo(int x) {\
+        this.x = x;\
+    }\
+\
+}"]{color:red}q[style*="quotes: none"]{quotes:none;}q[style*='quotes: none']{quotes:none;}q:after{content:": colon & escaped double \" quotes \".";}q:after{content:' (brackets & escaped single \' quotes \') ';}q:after{content:"I'm Quote";}
diff --git a/modules/simpletest/files/css_test_files/quotes.css.unoptimized.css b/modules/simpletest/files/css_test_files/quotes.css.unoptimized.css
new file mode 100644
index 00000000000..3fe0f7d503f
--- /dev/null
+++ b/modules/simpletest/files/css_test_files/quotes.css.unoptimized.css
@@ -0,0 +1,31 @@
+/* Example from https://www.w3.org/TR/CSS2/syndata.html#rule-sets */
+q[example="public class foo\
+{\
+    private int x;\
+\
+    foo(int x) {\
+        this.x = x;\
+    }\
+\
+}"] { color: red }
+
+/* A pseudo selector with essential whitespace wrapped in quotes. */
+q[style*="quotes: none"] {
+    quotes: none;
+}
+
+q[style*='quotes: none'] {
+    quotes: none;
+}
+
+q:after {
+    content: ": colon & escaped double \" quotes \".";
+}
+
+q:after {
+    content: ' (brackets & escaped single \' quotes \') ';
+}
+
+q:after {
+    content: "I'm Quote";
+}
diff --git a/modules/simpletest/simpletest.module b/modules/simpletest/simpletest.module
index 6a60d594926..ebc9b4bf05c 100644
--- a/modules/simpletest/simpletest.module
+++ b/modules/simpletest/simpletest.module
@@ -592,7 +592,8 @@ function simpletest_clean_temporary_directories() {
     $files = scandir('public://simpletest');
     foreach ($files as $file) {
       $path = 'public://simpletest/' . $file;
-      if (is_dir($path) && is_numeric($file)) {
+      // Ensure that cache directories are cleaned as well.
+      if (is_dir($path) && (is_numeric($file) || strpos($file, '1c') === 0)) {
         file_unmanaged_delete_recursive($path);
         $count++;
       }
diff --git a/modules/simpletest/tests/common.test b/modules/simpletest/tests/common.test
index ff399676305..f5b85bad0ba 100644
--- a/modules/simpletest/tests/common.test
+++ b/modules/simpletest/tests/common.test
@@ -1069,7 +1069,8 @@ class CascadingStylesheetsUnitTest extends DrupalUnitTestCase {
       'css_input_without_import.css',
       'css_input_with_import.css',
       'css_subfolder/css_input_with_import.css',
-      'comment_hacks.css'
+      'comment_hacks.css',
+      'quotes.css',
     );
     $path = drupal_get_path('module', 'simpletest') . '/files/css_test_files';
     foreach ($testfiles as $file) {
@@ -3244,3 +3245,55 @@ class DrupalGetQueryArrayTestCase extends DrupalWebTestCase {
   }
 
 }
+
+/**
+ * Test for block_interest_cohort.
+ */
+class BlockInterestCohortTest extends DrupalWebTestCase {
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Block Interest Cohort',
+      'description' => 'Check Permissions-Policy header to disable Google FLoC',
+      'group' => 'System',
+    );
+  }
+
+  function setUp() {
+    parent::setUp('common_test');
+  }
+
+  /**
+   * Tests that FLoC is blocked by default.
+   */
+  function testDefaultBlocking() {
+    $this->drupalGet('node');
+    $this->assertEqual($this->drupalGetHeader('Permissions-Policy'), 'interest-cohort=()', 'FLoC is blocked by default.');
+  }
+
+  /**
+   * Tests that an existing interest-cohort policy is not overwritten.
+   */
+  function testExistingInterestCohortPolicy() {
+    $this->drupalGet('common-test/existing_interest_cohort_policy');
+    $this->assertEqual($this->drupalGetHeader('Permissions-Policy'), 'interest-cohort=*', 'Existing interest-cohort policy is not overwritten.');
+  }
+
+  /**
+   * Tests that an existing header is appended to correctly.
+   */
+  function testExistingPolicyHeader() {
+    $this->drupalGet('common-test/existing_permissions_policy_header');
+    $this->assertTrue((strpos($this->drupalGetHeader('Permissions-Policy'), 'geolocation=(),interest-cohort=()') !== FALSE), 'The existing header is appended to.');
+  }
+
+  /**
+   * Tests that FLoC blocking can be disabled.
+   */
+  function testDisableBlocking() {
+    variable_set('block_interest_cohort', FALSE);
+    $this->drupalGet('node');
+    $this->assertFalse($this->drupalGetHeader('Permissions-Policy'), 'FLoC blocking can be disabled.');
+  }
+
+}
diff --git a/modules/simpletest/tests/common_test.module b/modules/simpletest/tests/common_test.module
index d092c9249c0..d7b97bc892b 100644
--- a/modules/simpletest/tests/common_test.module
+++ b/modules/simpletest/tests/common_test.module
@@ -52,6 +52,18 @@ function common_test_menu() {
     'access arguments' => array('access content'),
     'type' => MENU_CALLBACK,
   );
+  $items['common-test/existing_interest_cohort_policy'] = array(
+    'title' => 'Test existing interest-cohort policy',
+    'page callback' => 'existing_interest_cohort_policy',
+    'access arguments' => array('access content'),
+    'type' => MENU_CALLBACK,
+  );
+  $items['common-test/existing_permissions_policy_header'] = array(
+    'title' => 'Test existing Permissions-Policy header',
+    'page callback' => 'existing_permissions_policy_header',
+    'access arguments' => array('access content'),
+    'type' => MENU_CALLBACK,
+  );
   return $items;
 }
 
@@ -286,3 +298,19 @@ function common_test_js_and_css_querystring() {
 function common_test_cron() {
   throw new Exception(t('Uncaught exception'));
 }
+
+/**
+ * Page callback.
+ */
+function existing_interest_cohort_policy() {
+  drupal_add_http_header('Permissions-Policy', 'interest-cohort=*');
+  print __FUNCTION__;
+}
+
+/**
+ * Page callback.
+ */
+function existing_permissions_policy_header() {
+  drupal_add_http_header('Permissions-Policy', 'geolocation=()');
+  print __FUNCTION__;
+}
diff --git a/modules/simpletest/tests/form.test b/modules/simpletest/tests/form.test
index 23af5f4c7fc..a4213241e04 100644
--- a/modules/simpletest/tests/form.test
+++ b/modules/simpletest/tests/form.test
@@ -852,6 +852,12 @@ class FormsElementsLabelsTestCase extends DrupalWebTestCase {
     $this->assertEqual($elements[0]['title'], 'Checkboxes test' . ' (' . t('Required') . ')', 'Title attribute found.');
     $elements = $this->xpath('//div[@id="edit-form-radios-title-attribute"]');
     $this->assertEqual($elements[0]['title'], 'Radios test' . ' (' . t('Required') . ')', 'Title attribute found.');
+
+    // Check that empty name attribute is not printed on buttons.
+    $elements = $this->xpath('//input[@id="edit-form-button-with-name"]');
+    $this->assertTrue($elements[0]['name'] == 'op', 'Name attribute found.');
+    $elements = $this->xpath('//input[@id="edit-form-button-without-name"]');
+    $this->assertFalse(isset($elements[0]['name']), 'No name attribute found.');
   }
 }
 
diff --git a/modules/simpletest/tests/form_test.module b/modules/simpletest/tests/form_test.module
index 9f071826e5c..63730c9fd06 100644
--- a/modules/simpletest/tests/form_test.module
+++ b/modules/simpletest/tests/form_test.module
@@ -1022,6 +1022,16 @@ function form_label_test_form() {
     '#title_display' => 'attribute',
     '#required' => TRUE,
   );
+  // Button elements with and without name attribute.
+  $form['form_button_with_name'] = array(
+    '#type' => 'button',
+    '#value' => t('Button with name'),
+  );
+  $form['form_button_without_name'] = array(
+    '#type' => 'button',
+    '#value' => t('Button without name'),
+    '#name' => '',
+  );
 
   return $form;
 }
diff --git a/modules/system/system.install b/modules/system/system.install
index 43dc90c4e9c..0b79c105b04 100644
--- a/modules/system/system.install
+++ b/modules/system/system.install
@@ -535,6 +535,37 @@ function system_requirements($phase) {
     }
   }
 
+  // Warning for httpoxy on IIS with affected PHP versions.
+  // @see https://www.drupal.org/node/2783079
+  if (strpos($software, 'Microsoft-IIS') !== FALSE && (version_compare(PHP_VERSION, '5.5.38', '<')
+    || (version_compare(PHP_VERSION, '5.6.0', '>=') && version_compare(PHP_VERSION, '5.6.24', '<'))
+    || (version_compare(PHP_VERSION, '7.0.0', '>=') && version_compare(PHP_VERSION, '7.0.9', '<'))
+    )) {
+    $dom = new \DOMDocument('1.0', 'UTF-8');
+    $webconfig = file_get_contents('web.config');
+    // If you are here the web.config file must - of course - be well formed.
+    // But the PHP DOM component will throw warnings on some XML compliant
+    // stuff, so silently parse the configuration file.
+    @$dom->loadHTML($webconfig);
+    $httpoxy_rewrite = FALSE;
+    foreach ($dom->getElementsByTagName('rule') as $rule) {
+      foreach ($rule->attributes as $attr) {
+        if (@$attr->name == 'name' && @$attr->nodeValue == 'Erase HTTP_PROXY') {
+          $httpoxy_rewrite = TRUE;
+          break 2;
+        }
+      }
+    }
+    if (!$httpoxy_rewrite) {
+      $requirements['iis_httpoxy_protection'] = array(
+        'title' => t('IIS httpoxy protection'),
+        'value' => t('Your PHP runtime version is affected by the httpoxy vulnerability.'),
+        'description' => t('Either update your PHP runtime version or uncomment the "Erase HTTP_PROXY" rule in your web.config file and add HTTP_PROXY to the allowed headers list. See more details in the <a href="@link">security advisory</a>.', array('@link' => 'https://www.drupal.org/SA-CORE-2016-003')),
+        'severity' => REQUIREMENT_ERROR,
+      );
+    }
+  }
+
   return $requirements;
 }
 
diff --git a/scripts/run-tests.sh b/scripts/run-tests.sh
index f5c4a144f9f..b18fd142abb 100755
--- a/scripts/run-tests.sh
+++ b/scripts/run-tests.sh
@@ -156,6 +156,23 @@ All arguments are long options.
 
   --verbose   Output detailed assertion messages in addition to summary.
 
+  --fail-only When paired with --verbose, do not print the detailed messages
+              for passing tests.
+
+  --cache     (Experimental) Cache result of setUp per installation profile.
+              This will create one cache entry per profile and is generally safe
+              to use.
+              To clear all cache entries use --clean.
+
+  --cache-modules
+
+              (Experimental) Cache result of setUp per installation profile and
+              installed modules. This will create one copy of the database
+              tables per module-combination and therefore this option should not
+              be used when running all tests. This is most useful for local
+              development of individual test cases. This option implies --cache.
+              To clear all cache entries use --clean.
+
   <test1>[,<test2>[,<test3> ...]]
 
               One or more tests to be run. By default, these are interpreted
@@ -199,7 +216,10 @@ function simpletest_script_parse_args() {
     'directory' => '',
     'color' => FALSE,
     'verbose' => FALSE,
+    'cache' => FALSE,
+    'cache-modules' => FALSE,
     'test_names' => array(),
+    'fail-only' => FALSE,
     // Used internally.
     'test-id' => 0,
     'execute-test' => '',
@@ -380,6 +400,8 @@ function simpletest_script_execute_batch($test_id, $test_classes) {
  * Bootstrap Drupal and run a single test.
  */
 function simpletest_script_run_one_test($test_id, $test_class) {
+  global $args;
+
   try {
     // Bootstrap Drupal.
     drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
@@ -387,6 +409,8 @@ function simpletest_script_run_one_test($test_id, $test_class) {
     simpletest_classloader_register();
 
     $test = new $test_class($test_id);
+    $test->useSetupInstallationCache = !empty($args['cache']);
+    $test->useSetupModulesCache = !empty($args['cache-modules']);
     $test->run();
     $info = $test->getInfo();
 
@@ -422,6 +446,13 @@ function simpletest_script_command($test_id, $test_class) {
   if ($args['color']) {
     $command .= ' --color';
   }
+  if ($args['cache-modules']) {
+    $command .= ' --cache --cache-modules';
+  }
+  elseif ($args['cache']) {
+    $command .= ' --cache';
+  }
+
   $command .= " --php " . escapeshellarg($php) . " --test-id $test_id --execute-test " . escapeshellarg($test_class);
   return $command;
 }
@@ -677,7 +708,7 @@ function simpletest_script_reporter_display_results() {
     $results = db_query("SELECT * FROM {simpletest} WHERE test_id = :test_id ORDER BY test_class, message_id", array(':test_id' => $test_id));
     $test_class = '';
     foreach ($results as $result) {
-      if (isset($results_map[$result->status])) {
+      if (isset($results_map[$result->status]) && (!$args['fail-only'] || $result->status !== 'pass')) {
         if ($result->test_class != $test_class) {
           // Display test class every time results are for new test class.
           echo "\n\n---- $result->test_class ----\n\n\n";
diff --git a/sites/default/default.settings.php b/sites/default/default.settings.php
index 3e88c383430..f8941f94c5b 100644
--- a/sites/default/default.settings.php
+++ b/sites/default/default.settings.php
@@ -744,4 +744,19 @@
  * @see drupal_session_start()
  * @see https://www.php.net/manual/en/session.configuration.php#ini.session.cookie-samesite
  */
-#$conf['samesite_cookie_value'] = 'None';
+# $conf['samesite_cookie_value'] = 'None';
+
+/**
+ * Add Permissions-Policy header to disable Google FLoC.
+ *
+ * By default, Drupal sends the 'Permissions-Policy: interest-cohort=()' header
+ * to disable Google's Federated Learning of Cohorts feature, introduced in
+ * Chrome 89.
+ *
+ * See https://en.wikipedia.org/wiki/Federated_Learning_of_Cohorts for more
+ * information about FLoC.
+ *
+ * If you don't wish to disable FLoC in Chrome, you can set this value
+ * to FALSE.
+ */
+# $conf['block_interest_cohort'] = TRUE;
diff --git a/web.config b/web.config
index 1d82aab6399..dcf948dbb9d 100644
--- a/web.config
+++ b/web.config
@@ -26,6 +26,18 @@
           </conditions>
           <action type="Rewrite" url="index.php?q={R:1}" appendQueryString="true" />
         </rule>
+        <!-- If running on a PHP version affected by httpoxy vulnerability
+        uncomment the following rule to mitigate it's impact. To make this
+        rule work, you will also need to add HTTP_PROXY to the allowed server
+        variables manually in IIS. See https://www.drupal.org/node/2783079.
+        <rule name="Erase HTTP_PROXY" patternSyntax="Wildcard">
+          <match url="*.*" />
+          <serverVariables>
+            <set name="HTTP_PROXY" value="" />
+          </serverVariables>
+          <action type="None" />
+        </rule>
+        -->
       </rules>
     </rewrite>